Tracking a PSA Certified Item
 

I have gone on the PSA website and looked around to find an answer to my question but haven't gotten anywhere. I am looking to purchase an item that is inside a PSA tomb. I know that with most items, they rub that "DNA" ink on the item, but does that contain the sequence number for the item as well? Also, does PSA track the original person that obtained the COA? I am asking because the seller doesn't know how long the item has been in the tomb since he bought it in the tomb a few years back. Any info would be greatly appreciated.

Thanks